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Preheat oven to 350 degrees.
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In an electric mixing bowl, beat eggs until slightly foamy, about 1 min
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Add in white and brown sugar, beat on high speed until eggs and sugar are light and airy, about 3-5 minutes.
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Turn mixer off and add in baking soda, vanilla, and corn syrup. Mix on low speed for 1-2 minutes.
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Add in 1/2 cup of butter, mix on medium speed until well incorporated.
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Next, add in peanut butter and mix on medium speed for 1-2 minutes.
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With mixer on low speed, slowly add in old fashioned oats, about half cup to one cup at a time.
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Next add chocolate chips.
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Finally, add in M&M's and mix until just incorporated.
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Scoop cookie dough with a large spoon (generous tablespoon) onto cookie sheet. (I do 9 cookies per baking sheet). Slightly flatten the cookies before baking.
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Bake for 8-9 minutes, turning halfway through. Bake for 10 minutes if you like more of a crisp cookie. Let cookies cool on baking sheet for about 5 minutes and then move to wire rack (or newspaper, my mom always put her cookies on newspaper, so that's what I use, or I cut open a brown paper bag)